Grupo de Emisión Acústica

Permanent URI for this collectionhttp://48.217.138.120/handle/20.500.12272/1238

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Author: search.filters.author.Neyra Astudillo, Miriam RocioStart date: 2020

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    Ruido Magnético Barkhausen para el análisis de deformación plástica en AISI 439
    (Facultad Regional San Francisco -UTN, 2023-11-30) Neyra Astudillo, Miriam Rocio; Peláez, Pablo; López Pumarega, María Isabel; Gómez, Martin
    En este trabajo se estudia el comportamiento plástico del AISI 439a partir de la técnica de ensayos no destructivos de Ruido Magnético Barkhausen (RMB). Los objetivos son analizarla respuesta del RMB para diferentes porcentajes de deformación plástica y buscar una correlación entre ambas variaciones. Las probetas normalizadas fueron ensayadas en una máquina de tracción uniaxial a temperatura ambiente y a velocidad constante. Después de cada etapa de deformación, se midió el RMB. Luego, se realizaron análisis temporal y espectral de las señales de RMB. También se calculó el valor RMS (valor cuadrático medio) del RMB. Se observó un aumento en la amplitud de la RMB al aumentar la deformación hasta un valor determinado, después del cual disminuye. Los resultados obtenidos son prometedores para la aplicabilidad de este método magnético para la cuantificación de la deformación plástica.
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    Evaluation of plastic deformation in steels with magnetic and acoustic techniques
    (2020-02-06) Neyra Astudillo, Miriam Rocio; Nuñez, Nicolás; López Pumarega, Isabel; Ruzzante, José; Gomez, Martín
    Barkhausen Magnetic Noise (MBN) and Magnetic Acoustic Emission (MAE) are phenomena that occur in ferromagnetic materials which undergo changes in their magnetization. These phenomena are very sensitive to changes on microstructure and residual stresses. The MBN and MAE can be applied as monitoring techniques to detect plastic deformation in materials subjected to thermomechanical processes, such as machining and manufacturing processes. In this work, the plastic deformation in samples subjected to uniaxial tensile tests is investigated through MBN and MAE. Twelve stainless steel test pieces of two different materials (AISI 430 and AISI 441A), were tested. As a first step, in order to obtain their mechanical properties, two test pieces of each material cut in different directions with respect to the rolling direction, were tested up to rupture. The others were deformed in four stages on plastic deformation. After each stage, MBN and MAE measurements were made, in order to obtain a correlation with the strain and the magnetic situation of the materials. We present here the microstructural analyses, the study of MBN and MAE signals, correlating them with the state of deformation of the specimens.